<template>
  <div style="height: 100vh">
    <el-row>
      <el-col :span="isMobile ? 0 : 12" v-show="!isMobile">
        <system-background />
      </el-col>
      <el-col :span="isMobile ? 24 : 12">
        <div>
          <logo v-show="isMobile && !heightTooLow" />
          <div :class="['login', isMobile ? 'mobileLogin' : 'noMobileLogin']">
            <el-form ref="loginRef" :model="loginForm" :rules="loginRules" class="login-form">
              <h2 class="title">登 录</h2>
              <el-form-item prop="username">
                <el-input
                  v-model="loginForm.username"
                  type="text"
                  auto-complete="off"
                  placeholder="账号"
                >
                  <svg-icon slot="prefix" icon-class="user" class="el-input__icon input-icon" />
                </el-input>
              </el-form-item>
              <el-form-item prop="password">
                <el-input
                  v-model="loginForm.password"
                  type="password"
                  auto-complete="off"
                  placeholder="密码"
                  @keyup.enter.native="handleLogin"
                >
                  <svg-icon slot="prefix" icon-class="password" class="el-input__icon input-icon" />
                </el-input>
              </el-form-item>
              <el-form-item prop="code" v-if="captchaEnabled">
                <el-input
                  v-model="loginForm.code"
                  auto-complete="off"
                  placeholder="验证码"
                  style="width: 63%"
                  @keyup.enter.native="handleLogin"
                >
                  <svg-icon slot="prefix" icon-class="validCode" class="el-input__icon input-icon" />
                </el-input>
                <div class="login-code">
                  <img alt="please retry" :src="codeUrl" @click="getCode" class="login-code-img" />
                </div>
              </el-form-item>
              <el-checkbox v-model="loginForm.rememberMe" style="margin:0px 0px 25px 0px">记住密码</el-checkbox>
              <el-form-item style="width:100%">
                <el-button
                  :loading="loading"
                  size="medium"
                  type="primary"
                  style="width:100%"
                  @click.native.prevent="handleLogin"
                >
                  <span v-if="!loading">登 录</span>
                  <span v-else>登 录 中...</span>
                </el-button>
                <div style="float: right" v-if="register">
                  <router-link class="link-type" :to="'/register'">立即注册</router-link>
                </div>
              </el-form-item>
            </el-form>
            <div class="el-login-footer">
              <span>{{ footerContent }}</span>
            </div>
          </div>
        </div>
      </el-col>
    </el-row>
  </div>
</template>

<script>
import SystemBackground from '@/components/SystemBackground'
import Logo from '@/components/Logo'
import { getCodeImg, registerEnabled } from "@/api/login"
import Cookies from "js-cookie"
import { encrypt, decrypt } from '@/utils/jsencrypt'
import settings from '@/settings'
import { mobileFlag } from "@/utils/yxx"

export default {
  name: 'Login',
  components: { SystemBackground, Logo },
  data() {
    return {
      isMobile: false,
      heightTooLow: false,
      codeUrl: "",
      loginForm: {
        username: "",
        password: "",
        rememberMe: false,
        code: "",
        uuid: ""
      },
      loginRules: {
        username: [
          { required: true, trigger: "blur", message: "请输入您的账号" }
        ],
        password: [
          { required: true, trigger: "blur", message: "请输入您的密码" }
        ],
        code: [{ required: true, trigger: "change", message: "请输入验证码" }]
      },
      loading: false,
      captchaEnabled: true,
      register: false,
      redirect: undefined,
      footerContent: settings.footerContent
    }
  },
  watch: {
    $route: {
      handler: function(route) {
        this.redirect = route.query && route.query.redirect
      },
      immediate: true
    }
  },
  mounted() {
    this.checkScreenSize()
    window.addEventListener('resize', this.checkScreenSize)
    this.getCode()
    this.getRegister()
    this.getCookie()
  },
  beforeDestroy() {
    window.removeEventListener('resize', this.checkScreenSize)
  },
  methods: {
    checkScreenSize() {
      this.isMobile = mobileFlag()
      this.heightTooLow = window.innerHeight <= 660
    },
    getCode() {
      getCodeImg().then(res => {
        this.captchaEnabled = res.captchaEnabled === undefined ? true : res.captchaEnabled
        if (this.captchaEnabled) {
          this.codeUrl = "data:image/gif;base64," + res.img
          this.loginForm.uuid = res.uuid
        }
      })
    },
    getRegister() {
      registerEnabled().then(res => {
        this.register = res.data
      })
    },
    getCookie() {
      const username = Cookies.get("username")
      const password = Cookies.get("password")
      const rememberMe = Cookies.get('rememberMe')
      this.loginForm = {
        username: username === undefined ? this.loginForm.username : username,
        password: password === undefined ? this.loginForm.password : decrypt(password),
        rememberMe: rememberMe === undefined ? false : Boolean(rememberMe)
      }
    },
    handleLogin() {
      this.$refs.loginRef.validate(valid => {
        if (valid) {
          this.loading = true
          if (this.loginForm.rememberMe) {
            Cookies.set("username", this.loginForm.username, { expires: 30 })
            Cookies.set("password", encrypt(this.loginForm.password), { expires: 30 })
            Cookies.set('rememberMe', this.loginForm.rememberMe, { expires: 30 })
          } else {
            Cookies.remove("username")
            Cookies.remove("password")
            Cookies.remove('rememberMe')
          }
          this.$store.dispatch("Login", this.loginForm).then(() => {
            this.$router.push({ path: this.redirect || "/" }).catch(()=>{})
          }).catch(() => {
            this.loading = false
            if (this.captchaEnabled) {
              this.getCode()
            }
          })
        }
      })
    }
  }
}
</script>

<style rel="stylesheet/scss" lang="scss">
.mobileLogin {
  background-color: #353e54;
  height: 100vh;
  min-height: 400px;
}
.noMobileLogin {
  border-color: #bfbfbf;
  height: 100vh;
  background-color: #bfbfbf;
  min-height: 500px;
}
.login {
  display: flex;
  justify-content: center;
  align-items: center;
}
.title {
  margin: 0px auto 30px auto;
  text-align: center;
  color: #707070;
}

.login-form {
  border-radius: 6px;
  background: #ffffff;
  width: 400px;
  padding: 25px 25px 5px 25px;
  z-index: 1;
  .el-input {
    height: 38px;
    input {
      height: 38px;
    }
  }
  .input-icon {
    height: 39px;
    width: 14px;
    margin-left: 2px;
  }
}
.login-tip {
  font-size: 13px;
  text-align: center;
  color: #bfbfbf;
}
.login-code {
  width: 33%;
  height: 38px;
  float: right;
  img {
    cursor: pointer;
    vertical-align: middle;
  }
}
.el-login-footer {
  height: 40px;
  line-height: 40px;
  position: fixed;
  bottom: 0;
  width: 100%;
  text-align: center;
  color: #fff;
  font-family: Arial;
  font-size: 12px;
  letter-spacing: 1px;
}
.login-code-img {
  height: 38px;
}
</style>
